replacing

I'm thinking about replacing a rather boring radiator with a "designer" one, just for cosmetic reasons. My question is; can I easily replace it with a slightly smaller one? The pipes are coming up through floor tiles (see picture) and I really don't want to dig those up in order to move them...

Hi all - I have 11 interior doors and I want to change all the handles. My question is really about sizing - having shied away from all types of DIY I think I could do this one ;) but do I just simply order some from the Internet or do I have to be aware of sizing? For example, the ones I have...