On iStockphoto.com I have a small lightbox of medicinal capsules, pills, tablets. The colours were mostly added either by a coloured light directed on the white tablets or by a white translucent background illuminated by coloured lamps. The colours were easily added by filtration with coloured natural cellophane that works fine for cold lights.

Medicine tablets illuminated with red light over blue background. Large depth of focus (tilted lens)
Medicine tablets illuminated with red light over blue background. Large depth of focus (tilted lens)
Tablets, pills, capsules
Tablets, pills, capsules
Many; pills; capsules; tablets; medicinal; drug; abuse
Many; pills; capsules; tablets; medicinal; drug; abuse
Antidepressant tablets illuminated by red light over blue light
Antidepressant tablets illuminated by red light over blue light
Medicine tablets illuminated with red light over blue background.
Medicine tablets illuminated with red light over blue background.
Only the background was tinted
Only the background was tinted