Beautiful kitchen! Since you said 'classic and traditional', I was thinking that a beautiful wallpaper might work, maybe will a bit of silver to pick up on your fixtures/pulls. Alternatively, although you said you're not an art person, you might like prints of your favorite family or vacation photos (all in simple frames, not too many and not cluttered, in black and white always looks classic) or a cool map, nicely framed, if you're into geography or have a favorite vacation spot. Honestly, your kitchen is so pretty that I don't look at it and think "blank wall" - I notice all the rest of it.
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