I had seen ATCs (Artist Trading Cards - for trading, only) for several years, prior to ACEOs (Art Cards, Editions and Originals - always collectible sizee - 2.5x3.5" - acronym used when selling to ID - search eBay for this term, and other selling sites - Etsy, etc.) commencing in late 2004. Early 2005 I did my very first ACEOs to list on eBay. So I was used to mixed media methods, so my early ACEOs were exploring options to create. I'd done similar with a small number of ATCs which I created and traded in ATC online groups.
These are my first 3, They were sold within seconds of being listed on eBay. I was hooked! Not my best work, by any means, but fun to do. Many 100s of ACEOs created since, in all manner of different ways, and I've loved every moment of them.