Shrubs thru Ivy Tunnel

Photos are a good way to see your garden from a different perspective! I was looking at this photo thinking this area has alot of green but lacks colour. The pink heather provides a little late summer/ autumn colour; the calendula self seed and provide yellow flowers but I definitely need more wow factor! (A bit of a project to work on)
Plants pictured:
Variegated Ivy, Ornamental grass, Calendula annual flowers, Box hedge, Heather (pink), Harry lauder's walking stick, palm trees.