Cheap and easy and attractive? You aren't asking for much. lol It's like the old addage: "In choosing a mechanic, Fast; Cheap; Good. Pick any TWO!"
My interior ideas:
Easy and attractive: Woodgrain panels install in the dash in seconds and (IMHO) look great. They ain't cheap.
Easy and cheap: Spray paint your vinyl. Looks good...for about a week.
Cheap and attractive: Clean it! Not just ten quarters at the quick-e-wash. Take every piece of trim out and clean everything from the spedo bezel to the carpet UNDER the seats! Clean it to within an inch of it's life. What a job! (Cheap? Heck, you might even make a couple bucks when you take the shifter surround off.)
Cheap, easy and attractive? The only one I know, is to turn out the garage light and imagine how you'd like your car to look.