Gravel it all over - then what?

Hi, I have a triangular border either side of my front door. South-west facing and hard to grow anything as it's so hot and gets great cracks in it. Thinking of taking what's there out and then doing a gravel garden. Basically, membrane then gravel - but what to plant? I will leave the rose and pyracantha. Moving peonies only after flowering. There's a fig tree stump under the bucket which I'm digging out.

'To plant a garden is to believe in tomorrow.'
Audrey Hepburn
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The previous owners had laid pea shingle over black plastic sheeting so the soil underneath was very poor - it was also full of roots from neighbouring trees and hedges. As I removed the shingle and plastic quite a lot of the shingle ended up in the soil rendering it free draining. I laid weed suppressant membrane over the area and planted euphorbias (ones which like it dry), lavenders, rock roses and thrift. A bit of the bed gets a little more shade and there I have some aubretia and low growing dianthus. The prostrate conifers which were already there and a cherry tree were left in place.
I mulched between plants with pea shingle and larger pebbles - it's a bit like a shingley beach. The whole thing is edged with small boulders and large stones to stop the shingle creeping onto the road (it's a kerb side location). IMO it looks quite nice - definitely better than the weedy mess that was there before🙂
This was 2 years ago when first done - the plants have filled out a bit since then.
I know Monty has a dry garden - I found a pic here-
maybe some inspiration in there for you
https://twitter.com/themontydon/status/1265933704888803328
Wisdom is not putting it in a fruit salad.
Thank you @Chris-P-Bacon - I already have a builder's bag size of pea gravel to use up but I can easily get mulch. I finally got the fig dug out today! It's underneath the bucket in the main pic https://myextraordinarygarden.wordpress.com/2021/04/05/project-3-day-4-figgy-digging/