Well before the change on the thumbs I had them highlighted with a gradient, green for 90fps and blue for 120fps. Old screenshot but like this. Did that with a userscript/style, maybe it's because I got used to it but I liked to have those 90/120 scenes highlighted like that. Could be one idea...
Although now the background on the footer with the title/info is no longer black, but I have to say I'm not a fan of how that looks anyway. It's more messy in a way, the black background was more clear with attaching the info to the preview image/clip.
Considering the interpolated scenes are something special done by SLR I always thought those should be more highlighted visually than just the small text or icon thingy. There are two categories of course but while browsing newly added scenes or when on pornstar pages the background gradients I added really helped to spot them right away.