The Deering Roll

This is thought to be the earliest heraldic roll of it's kind. It shows the devices but no crests.

http://en.wikipedia.org/wiki/File:DeringRoll.jpg

Also try
http://www.bsswebsite.me.uk/History/Dering/deringroll.htm

http://en.wikipedia.org/wiki/Dering_Roll

Hyghalmen Roll

http://commons.wikimedia.org/wiki/Category:Hyghalmen_Roll
http://en.wikipedia.org/wiki/Hyghalmen_Roll
1447-1455



http://commons.wikimedia.org/wiki/File:Jesus_Coat_of_Arms_1.jpg

Jousting demo group

http://www.roundtableprod.com/RoundTable's%20Joust.htm

This group runs demonstration jousts. They have put a lot of effort into their gear, and seem to give a good heraldic display.

Model crests

http://www.heraldic-arts.com/article-ferguson1.htm
This website shows the model crests that someone has built.

Crests in the Codex Manesse

Images from the Manesse Codex are among the most well known of the period. Luckily, these illuminations show several helms. These images come from around 1340.

http://digi.ub.uni-heidelberg.de/diglit/cpg848/0243

http://digi.ub.uni-heidelberg.de/diglit/cpg848/0243

http://digi.ub.uni-heidelberg.de/diglit/cpg848/0007

http://digi.ub.uni-heidelberg.de/diglit/cpg848/007

http://cottesimple.com/wp/wp-content/uploads/2012/10/manesse_1_large.jpg

http://www.historyofinformation.com/expanded.php?id=2291

http://www.casabellini.org/wp-content/uploads/2009/02/manesse-codex-106.jpg

http://upload.wikimedia.org/wikipedia/commons/0/0c/Codex_Manesse_Bernger_von_Horheim.jpg

http://olvasmanyaid.blogspot.com.au/2012/10/lovagokrol.html

http://www.fioredeiliberi.org/phpBB3/viewtopic.php?f=4&t=1039

Check out those shoes!

http://upload.wikimedia.org/wikipedia/commons/4/44/Codex_Manesse_Johann_von_Brabant.jpg

Here are a couple of sites with more info on the Manesse Codex
http://www.ub.uni-heidelberg.de/Englisch/allg/benutzung/bereiche/handschriften/codexmanesse.html
http://commons.wikimedia.org/wiki/Codex_Manesse

Extant crest fibres

I have found the magic gold nugget of the internet! A fibre from a thread that held a helm crest on!

http://www.unc.edu/~dchaggis/2007%20Report.html

   
The website states:
 "Susan Muller-Wiering (Center for Textile Research,University of Copenhagen) submitted a report on a piece of thread recovered from a bronze helmet crest (02-0013) from A1400 in 2002. It is about 3 mm in diameter, with a z-spin direction, made of vegetal material. The fibers are very fine, clinging together in bundles. There are some so-called dislocations along the fibers, suggesting bast fiber, probably linen. It is seemingly a sewing thread, used to fasten the plume to the helmet crest."
  
Very exciting.

Ornate helms

https://www.pinterest.com/dianebriegleb/protective-head-gear/

This pin board has a collection of images of interesting decorated helms. No helm crests, though :(