Hiya, Gina!

I don't mind you asking anything at all.
ACEO stands for "Art Cards, Editions, and Originals."
They started as an artistic alternative to Trading Cards, like the old Baseball Cards, and the like.

The standard size for them is 2.5" x 3.5". I buy playing cards at Michael's Crafts that look like $100 bills on the back, and use those.
The card is decorated/altered using various mediums, like collage, paint, pastels, photography, ink, you name it.

Originally, they were just traded between people, but now they are also reproduced and sold, and auctioned on e-bay, etc... There are a few websites out there about them, like:

www.art-cards.org/
www.villageartclub.org/artcards.htm
www.artwanted.com/mb/topic.cfm

They're fun, they don't take terribly long to make, and they're wonderful to trade and exchange!

~M

awsome! I've been wanting to try out one of those mini altar things, made out of an altoid or matchbox...whattaya think?