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--
DIY Mod Podge - fill jar half way up with white glue, then fill jar up with water. This is a mixture glue/water. It will have a Matte finish. If you would like a Glossy finish, add 1 TBS of clear varnish.