I've had a number of people ask for this vintage pattern, so I thought instead of continuing to send it to people individually, I'll pop it up here.
It is from a vintage Australian crochet book, so it uses English crochet terminology, if you are used to following American patterns, please check the abbreviation chart for the stitches at the end of the pattern.
The pattern is for a scarf, so just increase stitches for a rug, using whatever crochet hook is appropriate for whatever yarn you are using.
Make 70 Chain
1st row - Miss 1ch, 1dc in each ch to end (69 dc)
2nd row - 3ch, 1tr in first dc *miss 3dc, 3tr in next dc, rep from * to last 4dc, miss 3dc, 2tr in last dc
3rd row - (change colour yarn) 2ch, *3tr in centre dc of 3dc missed in previous row (working over previous row), rep from * to end, 1 htr in centre ch of 3ch
4th row - 3ch, 1tr in space between htr and next group of tr, 3tr in each space between groups of tr to end, 2tr in space between last group and turning ch
5th row - (change colour yarn) 2ch, *3tr in centre tr of 3tr group 2 rows below (working over last row), rep from * to end, 1 htr in centre ch of 3 ch
6th row - as 4th row
7th row - as 5th row
8th row - as 4th row
Continue until work is desired length, changing colour of yarn every odd numbered row (5, 7, 9, 11, etc)
ch....chain (UK)...............= chain (USA)
dc....double crochet (UK)= single crochet (USA)
htr ..half treble (UK)........= half double crochet (USA)
tr.....treble (UK)...............= double crochet (USA)