I switch all the time. I've yet to find a steady foundation that I like. Although, I have started using L'oreal 16 hour foundation & powder - but the foundation is quite .. disgusting.. and I feel that I'll probably be switching soon as I go to the store again.
Face wash, I use L'oreal Skin Genesis - it comes in 3 different kinds - pre-wet wipes, soap, and a scrub. I've been using the scrub b/c they were out of the regular wash and it's making my skin dry out and hurt.. so I'll be switching back to the regular soap kind.
I also use a tinted acne solution by Neutrogena I believe.. It's a 4 hour removal. It doesn't work in 4 hours though, trust me, but it does work within about 12.
I can't use liquid eye liners, and I don't really like any kind of eyeshadow that's bright and colorful =\ Regardless of what I'm wearing, I usually stick to a neutral shade of brown.
Eyeliner, I haven't found one I really like all that well. I haven't switched because the two that I've got now are still pretty full. =\