One thing that I noticed is that if you go to Prepare Form in Acrobat, select ALL form elements in the menu on the right, then right-click one and change the font colour, etc, it changes ALL of them. Might not be practical if your forms are different colours, but if the majority of them are the same, this saves HEAPS of time! I only tried changing font colour, but I have a feeling you could change more if you wanted to.
One thing that I noticed is that if you go to Prepare Form in Acrobat, select ALL form elements in the menu on the right, then right-click one and change the font colour, etc, it changes ALL of them. Might not be practical if your forms are different colours, but if the majority of them are the same, this saves HEAPS of time! I only tried changing font colour, but I have a feeling you could change more if you wanted to.