Ice dyeing is a technique for creating random patterning on fabrics (or fibres and yarns!). The dyeing method below uses Procion MX dyes on cotton fabric.  
Ice Dyeing with Procion MX Dyes – George Weil
Tie-dyeing Cotton Onesies using Jacquard Procion MX Dyes
Tie-dyeing Cotton Onesies using Jacquard Procion MX Dyes
Ice Dyeing with Procion MX Dyes – George Weil
Fibrecrafts Procion MX Dyes for Cotton & Linen
Procion MX Cold Water Dyes for Cellulose
Fibrecrafts Procion MX Dyes for Cotton & Linen
Ice Dyeing with Procion MX Dyes – George Weil
Dyes & Dyeing – Page 4 – George Weil
Dyes & Dyeing – Page 4 – George Weil
Dyes & Dyeing – Page 4 – George Weil