Here's a few shot of group Echeveria and similar plants in local nurseries near me (most outdoor grown plants) in southern California just for fun of seeing these plants in large groups.

and of course Crassulaceae has a lot of great mass-flowering plants

oops forget one of my own plants… Oscularia deltoids

Mesembs make nice 'lots of flowers' shots

Of course there are aloes… great flowers! Aloe aculeata flowers again.jpg Aloe David Verity type 2 4 flowers 2 H.jpg Aloe debranas H march flowrin.jpg Aloe petrophila flowers nice Dec H.jpg Aloe pink Perfection again 2014.jpg Aloe principes shot even farther.jpg Aloe rupestris in full flower H.jpg A...

Here is mine after some years

best Cyathia shot is by John Dos… you're up!

As seen in the Euphorbiaceae.

Some ideas below:

Haworthia cooperi

Some buds from California