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Lupines are so pretty, sadly they don't do well in my zone 4 garden.

Here is a link that will refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/flowers/lupine/growing-lupines.htm

These are just one of many varieties of Lupine. Sometimes the cream will remain as such, but sometimes it will turn colors later. Since this colour is recessive, it will not express itself, unless the proper breeding has occurred. Sometimes this is just by chance.

You can purchase the seeds from many places online. I would also check your local nurseries.

Here is a link to more information: https://www.gardeningknowhow.com/ornamental/flowers/lupine/

Lupine are perennials. You can cut them back in fall or allow them to go to seed for more plants in spring. This article should help
https://www.gardeningknowhow.com/ornamental/flowers/lupine/growing-lupines.htm

There are many reasons this can occur. Mostly environmental, though. Here is an article that will help you pinpoint the exact cause: https://www.gardeningknowhow.com/plant-problems/environmental/fixing-color-faded-flowers.htm

Lupine seeds can be planted in very early spring, but tend to do better if planted in late spring and allowed to overwinter, blooming in the following spring like foxgloves. They have a very tough seed coat, and it’s a good idea to either soak seeds for 24-48 hours, or roughen them between two sheets of sandpaper before planting. Cover lightly with soil (1/8”) and tamp down the seeds well – making sure they make good soil to seed contact. Water in, and if the weather is dry, water lightly until germination which can take up to 10 days.

It is likely too warm in your beautiful climate for Lupines to grow as a perennial.
You can however grow as an annual.
These links have more information.

http://agriculture.vic.gov.au/agriculture/grains-and-other-crops/crop-production/growing-lupin
https://www.gardeningknowhow.com/ornamental/flowers/lupine/growing-lupines.htm