I'm looking for something to plant outside of a topiary frame. The topiary would be set in a mainly sunny area.

I am looking for something with a small dark green leaf, and if it gets flowers that would be OK, but I prefer small flowers - but not yellow. I know I can use Ivy, but I know from experience that many types of Ivy can be invasive. And if I do use Ivy, I would prefer something that would stay tight against the form and that won't grow too wild looking thus hiding the form that I've attempted to create. I'd like to put the form in place and grow the plants in the ground at the base. I've considered Morning Glory for this, but if anyone could offer me any different options I'd really appreciate your help.

Thank you. LLM