I take it you're primarily interested in aesthetics? You might find some inspiration from a Google search like ms access form themes (with or without restricting the results to images). I consider other things to be part of the design package, like following basic design used pretty much everywhere else when it comes to the placement and behaviour of things. That would include the location of the Close or Cancel button and having it first in the tab order - and maybe assigning keyboard shortcut keys to command buttons for those that like to use them.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.