You say nothing to heavy...Why?
Ivy can get very heave over time,
You could plant a couple of climbing roses at the posts supporting the
trellis.
Honeysuckle, Clematis- I'd use something like Tangutica Flower and seed
heads) Winter flowering Jasmine, and nothing to stop you planting Sweet peas
and Runner beans next year.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk