I love My Beauty Diary facial mask. I usually buy it from Uwajimaya (Japanese Grocery Store). They are very hydrating but works for all skin types. I had oily skin in summer and dry skin in winter. They are also available online but you have to be careful as there are counterfeited products. Crazy, because this mask is cheap! It's less than $20 for a box of 10 sheet mask. What's funny is that in Uwajimaya they also sell it individually for $1 each! So you actually get more when you buy individual package there.
Also if you want to do DIY, I have heard about using rice paper (the kind you would use to make vietnamese spring roll) as a gel mask. You basically just cut it to half, and cut one of the halves in two. You will end up with one half circle and two quarters circle. Then you just soak it in water that's added with whatever you want (the one I saw used rose water) and then put the half on your forehead and each of the quarters on your cheek. I haven't tried this but it looks just like gel facemask! I'd probably use lotion toner in it.
PS. Yogurt mask works wonderfully on oily skin! Just spread yogurt on your face, avoiding eye area, and then rinse it when you're done.