I haven't been doing this for very long so I might not have all the info correct. Looking back through the Swaps history, Red has been hosting 5" charms in yellows, reds, greens, oranges, blues, purples, and pinks. Before that there were color swaps done in FQ and 10 1/2" squares so it will be interesting to see what is next.
Somewhere in the last couple of swaps, Red has listed her categories but I can't find it. Could it be browns, grays, whites or blacks .... or maybe florals or stripes or circles .... or maybe light backgrounds. Oh, the anticipation .....