This is my best attempt for the ‘Apple’ challenge, unless I can think of anything better in the next few days.
This was taken at a ‘model village’ in the Harlow Carr RHS gardens near Harrogate. I desaturated it in The Gimp, leaving only the red component, and a little yellow and magenta, to highlight the apple. A few bits of red show up on the castle and grass and spoil the effect a bit. Also, it probably would have been better if I'd taken the shot from below to make the castle look bigger.