What are the best solar powered lights to use?

I want to get my parents some solar powered lights for the garden path in their new house.

The lights need to be bright enough for my mum to see where she is going but I know they won't like anything trendy looking or with funky colored lights. If I can't find any lights which are just plain white then I am wondering if it is possible to take the filters around the bulb out and put something clear in its place.

I don't really want to have to take the lights apart but if that's the only solution then that's what I will do. Surely it can't be hard to find outdoor lights that are just nice and plain?