Many of the newer digital cameras (both some point & shoots and some SLRs) have a feature for "art effects". They vary a little between brands, but the main ones are fairly consistent. If you've never played around with them, here's side-by-side examples on what the effects look like (photos are unedited and were shot with an Olympus E-620)

Left: soft focus, Right: light tone
L: pale and light color, R: pop art
L: pinhole, R: grainy film