I mix and match a lot. I really don't spend a whole ton of time searching though, I have a pretty good idea of what I want to use with what. I usually mix by colors and not theme though ((mainly since I don't buy too many theme products)). My main thing is I like to put a
lot on my pages, and I find a lot of times even one large kit just doesn't have enough for me. (I'm not too big on repeating elements lol) Lets see here's some mix-match pages I have on here
I have a lot more here in my gallery, and even more than that in
my gallery over at DST.