My oh my! 9 pairs? I'm very impressed. I knitted 9 soda can/water bottle cozies for friends as a 'beginning of school' gift.. in August and here it is in JAN and I haven't made my own cozie yet. *AND, they are tiny in comparision to felted slippers! So, yeah
So, I am impressed that you made all of these and it will totally be understandable if you don't make your own pair for a few months.