Michaels has about 8-10 colours of sheet foam 8.5 x 11 for about $1 each. It is kind of thin to float a chrysal chenille WB, and can be cut with thread if you warp too tight. I suggest 3/0 size thread. You can glue it together with fabric glue if you want thicker, but not worth it.
Michaels also has 30 sheets of sticky-back foam for $12, and if you stick two pieces together you CANNOT get them appart, which is a good thing IMO. The sheets are about 6x9 and again there are 8 or 10 colours in a pack.
They also have thicker foam which is great for floating bugs. Oddly they only sell it in 'cute' precut shapes like stars or leaves. I find the most useful are the packs of 4(?) that look like those signs you put over the doorknob in a hotel to ask for quiet (or service).
Just did a presentation at the club a couple of weeks ago on the
Wiggle Bug so I am up to date on foam (tiers are so picky). I used the sticky foam and put green on top and yellow underneath for a two-tone effect. Good luck!
