We're completely open to any creativeness input, but would like to explain what we're after, in general, so we don't waste anyone's time.
The created logo will be used mainly in a wide & short format (e.g webpage banner), but must be flexible enough to allow use in a square format (favicon, avatar, etc.) and that square format won't have the full Apperrific name.
Colours requirements are not set in stone; we like grey and orange, but earthy colours are OK too. As are variants of brown. Number of colours should be low, but gradients are OK.
Fun is OK, as is cheesy, as long as there is an identifiable brand in there. By that I mean, you're free to play with the logo, as long as there is a central focus that can be taken out of context and still be associated with the name.
Clean is a must. Some call it basic, some call it simple. Minimal artwork and detail, but enough to get a point across. We build our UI like that. So, while clouds might seem Web 2.0 and clean/earthy/cool, they are not very distinct. It would be hard to build a brand based on clouds without the name included. That said, clouds are fine as part of something; I'm not dismissing their use.
Use of the name should probably be all lowercase in a modern wide font-face. Again, not a hard rule. Tag line (which will change, but will always be short), and will initially be "Apps. Terrific ones."