What would look good next to this plant?

I have two large cherry plum trees at about 2m apart. Inbetween is an ugly wall and a fence that my neighbour erected. So I put a raised border between my trees and a seating area.
In this border I wanted to fill with some sort of nice looking hedge. I only need about 1.5m in height to screen.

Last year I picked up a Pittodporum - Silver Queen from B&Q and liked it a lot! However, I discovered it was best getting a couple more to fill in the area faster. (I was new to all this gardening lark last year)
I still however, I only have the one and now VERY undecided what to do. I've seen what it looks like as a hedge and it looks tremendously fussy! I don't think it'd look too out of place between the two trees but on the other hand, I'm debating whether to blend it with two other shrubs, or at least one other and move this plant over a bit to make it more even.

With my very limited knowledge in what's out there and buying things because I take an instant like to it rather than thinking ahead what it might look like in my proposed location, I'm at a loss of what to do..

The plant in question looks like this (mine is much smaller still, just over a foot in height)



I'm very stuck with what will go with this plant.
Can anyone give any ideas?

 

I would go with Escallonia "Apple Blossom".:gnthb: By the way, what`s a cherry plum?

 

Oh! I like that, it will add colour to an otherwise plain looking area. Thanks!
Any other suggestions?

Cherry plum is what a friend of mine thinks it is. It produces tiny fruit no more than an inch in size with a huge pip inside. VERY TASTY.

Looking up cherry plum on Google shows lots of red leaved trees but my two have never been red. They are green. However for a very short period they blossom with thousands of pure white flowers. It's just starting to do that now in fact. I love spring time for this very reason!

The fruit and leaves look like this:



And when it blossoms it looks like this:



The smell is incredible too. By my God it's stupidly fast at growing! Before my garden was tamed, these two trees virtually took over. The fruit drops and BAM up shoots another tree if you're not careful. It has lots of shoots popping out of the ground around it.
I even had a third tree hiding between them, it was still quite skinny but heading upto two metres tall. I uprooted him to gain the space and planted him elsewhere. It was more than happy to be moved. Unfortunately, I didn't want him where he was put then either so a few months later, I uprooted him again and gave him to a friend. It's still growing.

 

I suppose it could be some type of yellowgage? but it is rather orange in those photo's...

 

In the picture, they're not ripe. When ripe they go a deep red.

Ignore the red leaves, as said above, theleaves are green.

 

Hi, Brind

I would suggest it's a Prunus cerasifera 'P i s s ardi' like I have. I have the one that has dark red leaves which is the 'nigra'.