What to plant in this awkward space, to hide a small wall?

Just a quick one, what can i plant here... either in front or behind the concrete wall type bit, to hide the concrete?



And overall view from the front.



The tulips and daffodils are planted in front in the little border, obviously they only flower at the start of the year and then disappear, leaving a blank border.
I want to keep the tulips and daffodils, they are nice.
But i want something that will cover this step up, either grow up with the tulips etc, or be planted above the concrete and drape over, but leaving enough space for the tulips to grow.
I don't mind trimming the plant that goes there, at the start of spring when the bulbs come up so they have room, that's not a problem, but i'd rather not be able to see this step 90% of the time, so winter foliage is also a plus.
Also, i'd not like anything that grows too high, this level will only be artificial grass, but we want to see it when looking up the garden from the house.

Ta in advance

 

If its not full sun what about heucheras they provide lots of colour all year and are bushy and put up delicate flowers

Or some very small hebes that dont grow to high or big. My tulips just grew through my hebes or around them and were fine. I have one thats low growing and wont get large but cant remember the name it has lovely stealy duck egg blue leaves though

These ones grow to 30cms high which looks around right for that wall but its hard to acurately tell

https://www.rhs.org.uk/Plants/98167/Hebe-pinguifolia-Pagei/Details?returnurl=/plants/search-results?context=b%253D0%2526hf%253D10%2526l%253Den%2526q%253DHebe%2526s%253Ddesc%252528plant_merged%252529%2526sl%253Dplants%2526r%253Df%25252Fplant_height%25252F0.1-0.5%252Bmetres&s=desc(plant_merged)&query=Hebe&f_plant_height_0.1-0.5_metres=f%2fplant_height%2f0.1-0.5+metres&form-mode=false&unwind=undefined&page=1&aliaspath=%2fplants%2fsearch-results

https://www.rhs.org.uk/Plants/93654/Hebe-pimeleoides-Quicksilver/Details?returnurl=/plants/search-results?context=b%253D0%2526hf%253D10%2526l%253Den%2526q%253DHebe%2526s%253Ddesc%252528plant_merged%252529%2526sl%253Dplants%2526r%253Df%25252Fplant_height%25252F0.1-0.5%252Bmetres&s=desc(plant_merged)&query=Hebe&f_plant_height_0.1-0.5_metres=f%2fplant_height%2f0.1-0.5+metres&form-mode=false&unwind=undefined&page=1&aliaspath=%2fplants%2fsearch-results

 

Aubretia is a good one for growing over a wall and it's evergreen.

 

There's also Alyssum Saxatile which has yellow flowers and grows very well with Aubrietia.

 

It's on my list for tonight!

 

The stonework looks good. I would face that little wall with tiles or maybe wood? Then it would look attractive even when your plants are in limbo