The best replacement for themes is motifs.

The best alternatives to themes are rated as following:
★★★★★  motifs
★★★★  topics
★★★  templates
★★★  morals
★★  ideas
★★  backgrounds
★★  skins
★  layouts
★  concepts
★  symbols
  personas
  life lessons
  units

Your alternative for themes is not listed? Suggest!
Speaking about themes, one probably shouldn't forget about endless scroll.

Other search terms related to themes and their ratings are:
★★★★★ endless scroll
★ sounds for windows 7
You have in mind a companion for themes and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of themes in all years. Click on graph for more.
themes
motifs
topics