More to explore:
crochet rug patterns free | HALF CIRCLE CROCHET RUG PATTERN | CROCHET FREE PATTERNS
Crochet Bath Rug
T-shirt yarn bath mat rug
Ravelry: T-Shirt Tarn Bathmat Rug pattern by Cindy RecycleCindy
DIY: Friendship Bracelet chevron rug (need to do this in black, white, teal, and yellow for baby's room!)
Crochet Doily Rug | Maker Crate
DIY Old T-shirt Crochet Rug.
Love this! Will find the time to make!!! Ravelry: Hexagon Motif Bathmat pattern by Pierrot (Gosyo Co., Ltd)
Crochet butterfly rug. I want to make this.
Pattern is a PDF in the comments. Pattern is written in Finnish. Use Google Translate to get the English version.
13 recycled t-shirt projects | BabyCenter Blog
Ooty: By your bed/Bathmat/Doormat Rug - Free Crochet Pattern This one uses t-shirt yarn.
Butterfly Rag Rug free crochet pattern
CROCHET SOCK MONKEY RUG-for when I get so good at this that I can figure out the pattern-lol
I crochet a lot, so crocheting together bits of old tees for a nice bath mat would be nice.