I grabbed the first 2 skeins from the stash that would felt. Oddly enough, the colours work together pretty well. Not that I was going to be picky for a pair of house slippers. 
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Whether that is enough for a pair, remains to be seen. I have small feet. There is more feltable wool in the stash. So slipper #2 might be more multicoloured. Time will tell.
I'm off to play with the Black Tomato.
Ciao