Key securing ideas
Here's a list of security tags available and methods of securing keys using either those tags or a padlock (depending on your requirements), invented by Mortice and KitSub.
Click on any picture to zoom in.
Securing Methods
Shot glasses
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure1" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure1" rel="nofollow"><img src="" alt="MortKeySecure1_small.jpg" /></a> Two plastic shot glasses drilled through, security tag through them, key in the bottom between glasses <a name="Tubing"></a>
Tubing
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure2" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure2" rel="nofollow"><img src="" alt="MortKeySecure2_small.jpg" /></a>
Piece of tubing holding key bent over and cut with slits so security tag can prevent removal of the key
<a name="Disks"></a>
Disks
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure7" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure7" rel="nofollow"><img src="" alt="MortKeySecure7_small.jpg" /></a>
If this tag were tightened, the key between the disks would be unuseable
<a name="Ring"></a>
Ring
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure8" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure8" rel="nofollow"><img src="" alt="MortKeySecure8_small.jpg" /></a>
Securing a key half way through a ring means it's unusable
<a name="Bolt_1"></a>
Bolt 1
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure9" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure9" rel="nofollow"><img src="" alt="MortKeySecure9_small.jpg" /></a>
A key secured part way through the end of a door bolt makes it unusable (this tag is a cable tie but needs to be a security tag)
<a name="Bolt_2"></a>
Bolt 2
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure13" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure13" rel="nofollow"><img src="" alt="MortKeySecure13_small.jpg" /></a>
This was originally part of a bolt, but the security tag keeping the key through the hole means the key isn't useable
<a name="Box"></a>
Box
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure14" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure14" rel="nofollow"><img src="" alt="MortKeySecure14_small.jpg" /></a>
Two holes drilled in the lid and two in the base of this box, so a security tag can be used to hold it closed (bit too loose in this pic)
<a name="Coke_Bottle"></a>
Coke Bottle
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure10" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure10" rel="nofollow"><img src="" alt="MortKeySecure10_small.jpg" /></a>
A coke bottle drilled through head and secured with security tag
<a name="Ketchup_Bottle"></a>
Ketchup Bottle
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure12" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure12" rel="nofollow"><img src="" alt="MortKeySecure12_small.jpg" /></a>
A ketchup bottle drilled through top and secured with security tag
<a name="Security_Tags"></a>
Security Tags
<a name="Ring_Seal_Tag"></a>
Ring Seal Tag
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure3" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure3" rel="nofollow"><img src="" alt="MortKeySecure3_small.jpg" /></a>
Ring Seal from <a href="http://shop.comdir.co.uk/Products.aspx?intGroupID=925" class="external text" title="http://shop.comdir.co.uk/Products.aspx?intGroupID=925" rel="nofollow">Component Direct</a>
<a name="Pull_Secure_Tag"></a>
Pull Secure Tag
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure4" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure4" rel="nofollow"><img src="" alt="MortKeySecure4_small.jpg" /></a>
Pull Secure from <a href="http://shop.comdir.co.uk/Products.aspx?intGroupID=925" class="external text" title="http://shop.comdir.co.uk/Products.aspx?intGroupID=925" rel="nofollow">Component Direct</a>
<a name="Perma_Lock_Tag"></a>
Perma Lock Tag
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure6" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure6" rel="nofollow"><img src="" alt="MortKeySecure6_small.jpg" /></a>
Perma Lock from <a href="http://shop.comdir.co.uk/Products.aspx?intGroupID=925" class="external text" title="http://shop.comdir.co.uk/Products.aspx?intGroupID=925" rel="nofollow">Component Direct</a>
<a name="HealthMark_Tag"></a>
HealthMark Tag
<a href="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure5" class="external text" title="http://gallery.mortice.org/cgi-bin/img.cgi?id=MortKeySecure5" rel="nofollow"><img src="" alt="MortKeySecure5_small.jpg" /></a>
Security Tag from *<a href="http://www.hmark.com/locks.aspx" class="external text" title="http://www.hmark.com/locks.aspx" rel="nofollow">Healthmark</a>