Yes! 'No yellow' is the commonest comment I've had, too.
Although, there is a rather wonderful woman - with a very posh voice - who always orders 'vulgar colours, darling - all clashing, please!' And they do look wonderful. I'm not sure there is so much distance between that and all the tasteful Sarah Raven, purple/lime green/apricot, which has become so trendy.
@GertrudeJekyllAndHyde, there's a begonia I absolutely love, that's a wonderful orange colour with cascading pointed flowers. I don't so much enjoy the little white/pink/red ones you get, but there are some that are really joyful.
@Vegemiteandhoneyontoast - that's such a lovely story, and such a lovely memory. Gardens are so emotional, and so nostalgic, aren't they? I can't look at a pelargonium without thinking of my lovely grandpa, who grew them (and that's probably true of 50% of people my age!). Lord Bute is gorgeous - there's a very snob garden near me (Jackson's Wold) that had it looking very nice in an elegant pot this year. And my mum grows what she calls 'Not The Marquess of Bute,' because years ago, a friend gave her a slip of a dark-red pelargonium, with the advice it was 'Not the Marquess of Bute but similar'. In the pre-internet days when you couldn't so easily research these things, mum assumed there was a bona fide geranium called 'Marquess of Bute' and she'd got something that wasn't quite the true specimen. I suspect her friend had meant to indicate she was just muddle about the name. But I like 'Not the Marquess'.