Inexpensive craft store frames fit perfectly around light switch covers! --I like the LOOK Expensive (but not really BE expensive! -- 31 Easy DIY Upgrades That Will Make Your Home Look More Expensive--
Toilet Paper Shelf - Just buy a "shadow box" from a craft store and paint! (I probably wouldn't use this idea specifically for a toilet paper shelf, but worth remembering for other places around the house)
DIY Framed Mirror Tutorial~ Thick baseboard, and some corner round molding. cut a frame, after measuring the mirror. using 45 degree anglesattached the corner round to the edges of the frame with some wood gluecouple coats of semi-gloss white paint.