I also have an old laptop that i hope to turn into a picture frame by taking out the screen. Thinking maybe mount it on the wall for a little table (some plexiglass over it to make it level over the keys) or flatten it out, not sure if that is possible, to hang it on the wall so it is flush with a pic in it. Just an idea.
I cannot say for certain that using your microwave for crafts isn't a good idea but I believe you are on the right track. There are a lot of websites against the use of microwaves for even food cooking. If you want to make candles the easiest way to melt the wax is to use a can in a pot of hot water on the stove (like a double boiler). Also you can do the vinyls in the oven on low heat. THis way you won't have to worry about harming your mic. Microwaves hold smells very well too - mine usually smells like popcorn