Just cut apart an old Venetian blind.
<a href="http://www.flickr.com/photos/southslope/8030635749/" title="001 by edible_plum, on Flickr"><img src="http://farm9.staticflickr.com/8320/8030 ... d1ec_z.jpg" width="640" height="480" alt="001"></a>
Works great...now to get caught up with all my seedling labelling.

Barb