[blotter_paper]

That part doesn't seem too unreasonable to me, but you could also just go with the largest available size and then scale it as necessary on the client.

[missblit]

Scaling down the largest size isn't always appropriate (though would probably work in most cases).

One example might be a set of images where the smaller images wrap text more agressively to work better on a screen that's not as wide.

[blotter_paper]

Good point, I've seen comparable use cases in the wild but it slipped my mind!