tiler cut holes too big for pipework, now have a massive gap around pipe...

[obsessedwithinteriors]

what can I fill these with?

too small to cut a slither of tile and nothing to stick it onto?

polyfilla? surely, that will look crap....

arrrrgggghhh

Is it for a heated towel rail/radiator? If so, how about something like this -
pipe collar

You can get different sizes depending on the width of the pipe, and also colour - plain white is an option if it fits your colour scheme better.

No, it's the pipes behind the sink and the toilet! Thank you for suggestion.