Hello,
@Ludsky
The stars are for the rating, vote or just display.
@S@f
First, I think it's better than icons don't look too close to buttons. They won't be clicked, they will just display informations. Could you retry with a black border and a other background image?
Then, I think we can try to be a little more imaginative. He have some ideas, but no time before the week-end. I don't care if someone stole it

.
Alpha, Beta => Use wooden plank or some construction equipment to make background.
RC => A graduate cap, maybe mark with letters RC.
Featured => If we use heart in the list, we can also use heart for this icon.
Bad/Good texture => A kart is good, but some add-ons aren't for kart. I don't know if it's a good choice.
DFSG => I have thought to use a gnou as for gnu, but I'm not sure it fit the definition.
Otherwise, the stars is good, but I need it bigger. Add-on loading have a lot of empty space. So, could you make the image fit the size of 128x256 or 128x512?
Currently, it's a idea of Auria to add icons on add-on loading screen. I don't know if we can use it for the website.