• BG colour e.g. black
  • No gap, large or 1px gap
  • Square, landscape, portrait or different dep. on setting on each project (as is now)
  • Captions over the top or beneath and on hover or always showing
  • Effects on photos as you mouseover e.g. greyscale effect, fade out, blur on hover
  • Display title only or title and description 
  • Number of columns
  • Show categories or not and show current category

Square and 1px gap between, desaturated until hover – looks less messy, so could be good for homepage. Hide categories.