The best replacement for ivy is poison oak.

The best alternatives to ivy are rated as following:
★★★★★  poison oak
★★★★★  maven
★★★★  sandy bridge
★★★  haswell
★★★  shingles
★★  virginia creeper
★★  poison ivy
★★  english ivy
★★  arctic pine
★  orchid
★  ivy
★  oak
★  crystal trees
★  poison sumac
★  willows
★  taki
★  poison oak rash
★  gradle
★  sawmill
★  haswell i7
★  ant
★  yews
★  haswell i5
★  karen
★  north west
★  karen smash
★  bug bites
★  chicken pox
★  crystal tree
  oak rash
  catwoman
  athletes foot
  boston ivy
  pachysandra
  impetigo
  wait for haswell
  lac
  sandy
  ivy blue
  herpes zoster
  sumac
  chiggers
  vine
  bug bite
  haswell benchmarks
  scabies
  ringworm
  creeping charlie
  state school
  kudzu

Your alternative for ivy is not listed? Suggest!
Speaking about ivy, one probably shouldn't forget about ant.

Other search terms related to ivy and their ratings are:
★★★★★ ant
★ contact
jay z
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Google Trends

Scale is based on the average worldwide traffic of ivy in all years. Click on graph for more.
ivy
poison oak
maven