Here is Doc-Fai Wong's Tai Chi ranking system. Don't know if this gives any ideas.
From
http://www.plumblossom.net/TaiChi/ranking.htmlBlue Sash / No Fringe1. Tai Chi Walking, Cloud Hands
2. Brush Knee, Parting the Horse’s Mane
3. 8 Brocade Exercises
White Fringe1. 8 Step Form to Partition Horse’s Mane
2. 8 Step Form to Kicks
3. 8 Step Form (Complete)
Yellow Fringe1. 16 Step Form
2. Single Push Hands
3. Double Push Hands Pattern
Orange Fringe1. Left and Right Tai Chi Fan
2. 24 Form (Complete)
3. Moving Step Push Hands
Green Fringe1. Plum Blossom Fan
2. Plum Blossom Sword Form
3. Free Style Push Hands
Blue Fringe1. Da Lu Push Hands
2. 40 Form
3. 32 Tai Chi Sword Form
Purple Fringe1. 108 Form to 1st Cross Hands
2. 108 Form to 2nd Cross Hands
3. 108 Form (Complete)
Red Fringe (Black Sash)1. 48 Form to Punch Downward
2. 48 Form Complete
3. Tai Chi Saber Form
Brown FringeTwo Person Saber, Tai Chi Long Sword Form
1st Stripe: Wind Chasing Fan, Two Person Form
2nd Stripe: Five Elements Broadsword, Five Elements Flute
3rd Stripe: Yuen-Chou Sword, Taming Dragon Staff
4th Stripe: Plum Blossom Flute Form, Small Plum Blossom Broadsword Form
5th Stripe: Tai Chi Spear, Ying-Yang Double Jian
Black FringeBig Frame Fast Form, Plum Blossom Double End Staff
1st Stripe: Sun and Moon Twin Wheels, Yang Fajing Form
2nd Stripe: Dragon and Tiger Double Stick, Plum Blossom Double Jian
3rd Stripe: Hung Dragon and Phoenix Twin Wheels, Small Circle Fast Form
4th Stripe: Nine House Cane-Sword, Plum Blossom Mother and Son Saber
5th Stripe: Golden Dragon Cane-Sword, Ying-Yang Five Elements Palm
*Additional Forms with Grandmaster Doc-Fai Wong