Ice blue was the standard color for the vinyl convertible top and side screens on MGA 1500 cars painted Glacier Blue, Ash Green and Tyrolite Green. The Tonneau cover could be either Ice Blue or Black. The Ice Blue top and side curtains were also optional on a Black 1500 (otherwise Black on Black).

Best picture currently available for the original Ice Blue vinyl top.

This picture is from "First of a New Line" brochure for introduction of the MGA. Ice Blue is actually Grey with a Light Blue or Blue/Green tint. This picture appears to be air bushed. Notice the Isinglass side windows are shaded blue. If you remove that much blue from the convertible top you may get closer to the original grey with a blue or blue/green tint.

There is an interesting story about the search for Ice Blue on a web page by David Breneman. I recon you can ignore the reference on that page to Leonard Nimoy, but the rest of the story is interesting.

This snippet of material supplied by Todd Clarke (Clarke Spares and Restorations) from a New Old Stock tonneau cover is probably close to the real color. It looks Grey next to a dot of Glacier Blue paint. If you cover the blue dot and stare at it for a while you may see the blue tint in the grey fabric.

The following pictures came from an eBay ad in November 2014. For as long as it may remain available it was eBay item number 141450938780 (finished auctions).

On 7/11/2022, Mark Wellard in Australia wrote:
You mention that you would like to see a picture of an original ice blue hood. So would I! However, Bob West has had some vinyl paint made up to match the original and I have attached a picture. I have seen a sample and it matches the remnants of my original very well. The second picture shows the Bob West sample overlayed on a NOS sidescreen.
It's interesting to note that there are some tonneau covers with a more blue/grey colour being represented as ice blue but these are not correct. The original ice blue has a mixture of blue and green that would make it blend with the paint colours of the day (Tyrolite Green and Glacier Blue).