Lucy’s Pyrex Mixing Bowls were a nesting set in bright colors which we only see in grayscale on the show, but we can see the original colors in the original vintage sets that are still available for collectors. See this set on eBay today:

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Vintage borosilicate  Pryex dishes made by Corning are more heat resistant and shatter proof than present day products bearing the Pyrex label which are made from inferior glass.  However they have to be more than 25 years old to be sure they are indeed Corning dishes. (Read more at http://www.snopes.com/food/warnings/pyrex.asp)

Tip for Collectors:
Do not put your vintage Pyrex in the dishwasher.
FAQ for Pyrex collectors at:  http://www.pyrexlove.com/faq/