Fight me if I'm wrong (and I'm not) but beacons decorated with multiple types of mineral blocks are the best and my sins are forgiven every time I see one
This is the one from my base, I luv it obviously
This one is one of my fav. A lil on the expensive side, but at least it's classy xD
Simple & more complex designs
The light beam of a beacon can go throught another beacon, so if you have two of them you can bury the actual mineral blocks and still make it seem like the beam is produced by the top one
And it's even better if you get creative with it and pair it with other blocks/stairs! You can also use the glass pane trick (putting a single glass pane right over the beacon to change the beam color without anything being visible)
Seriously. This shit rocks. Give some love to your beacons!! With how expensive they are you deserve to expose them to the world!! Make them a work of art!
All of these are fully powered, of course. And probably less expensive than the usual flex ones since you can put iron or emerald in the non visible parts.