Recommendations for straight, native plants

[wezza]

Hey guys, i'm hoping for a few recommendations for plants as we have recently had our family driveway renovated, and have had 6 planter boxes installed along its length.  

 

As they're along the driveway id prefer not to have big bushy plants that will require constant attention to prevent blocking cars. 

 

Cactus are the obvious choice, but was wondering if there's some other plants that would pair well. 

Don't necessarily have to be native, but would be preferable. 

Vines would be ok, but an invasive creeper that will entirely infiltrate the brush fence is going to be a hassle.

 

The boxes measure approx 15cm wide, 50cm long and 30cm deep.

 

any recommendations would be grateful.  Thanks :D 

[bardo]

What about something along the lines of lavender and marigolds, something with awesome colour combinations

maybe some succulents and cacti, there usually pretty low maintenance plants