Yeah, you certainly can. It depends how big you want the photo on our you wall to be. Just about any consumer camera can do nice 8x10s. A really nice 20x30 is going to take a pretty expensive camera, but I'm guessing that's not what you're looking for.
If you are just looking for 8x10s, don't get too caught up in the camera's "megapixels," because most of them will be good enough for that right now. Look at reviews on sites like
dpreview.com and see how the cameras are reviewed for sharpness, noise, and color. Megapixels are still the most common selling point used by salesmen, but enough is enough -- those other aspects are where you'll find the real differences for most cameras.
Another common, misleading selling point is the zoom, because people like the idea of getting good pictures of stuff that's far away. Consumer cameras just can't do that very well, though, even if they're marked as "12x zoom": they'll get you zoomed in, but the pictures will disappoint. For zoom, 3x or 4x is enough. Anything more than that and you're bound to get a lot of blurry pictures. Long-zoom photos from point+shoot cameras just don't work well unless conditions are ideal (steady hand, good lighting, etc). Your best wall-hangers are almost certain to come from the low end of the zoom range.