The multicoloured background is quilted in a large swirl pattern in a red/yellow/blue/green Rainbows thread by Superior coloured. I love Rainbows and am so pleased i cna use them more now; I quilted the whole lot in one go (have I mentioned how terrific the huge 820 bobbins are? Although they come at a price - the best I've found is about $3.50 each - yes, each!) and without a single thread break or other problem!
I used the same rainbow thread to quilt around the butterfly, then filled the wings with a few open feather plumes.
Then I swapped to white bottomline to quilt in the ditch around the snall caterpillar blocks, and fill the background wth wavy McTavishing-inspired lines, and I did experience quite a few thread breakages here.
I dithered for a while about how to fill around the large caterpillar and the butterfly, then inspiration hit, and I chose large pebbles to match the ranbow spot print surrounding them - perfect! For these I switched to a white 50wt Gutermann cotton. Although I think the Bottomline would be better for pebbling, until I figure out how the 820 wants me to treat it, the 50wt cotton was much easier. I quilted in the ditch around these blocks, too.