I recently sold two Tenchi OVA cels on eBay that 
had been featured in the Japanese Tenchi trading 
card set.  Of course, I included two cards with 
each of the cels, so that the new owner could 
frame the cel together with the front and back of 
the card, if he or she wanted to.  :)  Heck, that 
was my original plan... but then I fell painfully 
in love with Slayers and a lot of my best Tenchi 
cels suddenly just looked like a good means of 
buying more Zels.

Oh, I'm SUCH a little cel zombie...