There's all kinds of Gods (and Goddesses!) for healing and love.
Aphrodite likes roses, and seashells. Anything to do with love. Maybe even sand! She was formed from the sea foam and carried to the beach, so sand might work well.
Apollo likes music. Although He is a patron of music lovers and preformers, simply singing to Him or dedicating a song for Him, maybe even writing a poem would do just fine.
Asclepius is mostly a medicinal God. An "offering", that's a little creative, could be crushed up asprin. It'll work, haha.