http://www.etsy.com/listing/102158324/vintage-80s-apple-porcelain-knobs-set-of?ref=sr_gallery_13&ga_search_query=apple+cabinet+pulls&ga_view_type=gallery&ga_ship_to=US&ga_search_type=all This is a set of 11 knobs with an apple painted on them. I did not know if you wanted apple shape or just apple theme. Etsy.com is a wonderful place to find such things.
Have you thought to get some wooden ball knobs, painting them red and adding some plastic (leaf beads from craft store) or polymer clay beads as leaves? That would work for the knob parts at least and be very cute.
Believe it or not...try Menard's if you have one in your area...they have a huge selection that other places do not---and they custom order great stuff! also...their prices are reasonable! another odd place? Hobby Lobby!
Ebay has several. Here is one for 1.69 each
I wanted fruit knobs. We bought fruit shaped magnets and attached them to wooden knobs.
Go to any craft store (Hobby Lobby, Michaels, A.C. Moore etc.) and buy some flat wooden apples, abt. 50 cents. Paint according to choice. Attach to a knob with a screw from the botton side.
How many do you need I have some! I have everything for a kitchen if you need apple for the walls