I participated in a swap in the Gina K forums recently. The swap was for tin trading cards, just like ATC's but small enough to fit in an Altoid tin.
This is the TTC I made. I used the daisy from Flowers for Daisy and the lavender & sentiment from Botanical Dreams. I colored the daisy with Koh-i-noor pencils and heat embossed it with clear embossing powder. The background is sponged on glossy cardstock.
The dimensions for the TTC's were 2 by 3 1/4 with rounded corners. This was my first swap. It was fun and I love seeing all the wonderful TTC's that I received. They are pictured below.
Aren't they all terrific?! I am definitely planning to do more swaps.