I had one of these machines for 10 years, Finally I decided I wanted a new one, bought a singer and hated it, returned it and bought a new brother (I had already foolishly sold the old one) The new one is alot quieter but other than that it's the same awesome machine.
I'm thinking a variety of dollar store or thrifted picture frames, leave out the glass and frame some brightly colored scrapbook paper. Then use some Command Adhesive tape to attach them to the doors. Command Adhesive comes off without much effort and doesn't damage the surface that is is used on. I use it to hang everything so I don't have to make nail holes.
i love my serger and I use it alot. I doesnt replace your regular machine though, it is an addition to it. Makes sewing knits easier, give a more professional look to your projects. Great for sewing for home dec, think yards of curtains and so on. If you just have a basic machine you might want to get an upgrade to that first, then think serger. Really depends on how much you think you will use it. A basic serger can be had for about 200 bucks.
I use mine to do rolled hems, yards of ruffles, seam finishes for curtains and things. I make alot of halloween costumes and use it alot to give a finished look to the seams and hems.