Sort of but not in any significant way.
This forum is NOT vBulletin and the alternate themes would only introduce a higher potential for coding bugs so there are only 2 styles, of which i thought this was the best and most reliable, as it's the default theme as shipped with SMF 2.0.10.
But if this changes, you will be made aware of the alternative presentation styles or themes.
You may however try to change it via the Portal, as there is a "core" theme that is also robust.