White and cream can work together and it is a great idea to paint all your trim white to freshen and lighten your room. Whether your cream blinds look dirty if you paint the trim white will really depend on the cream tone/shade of your blinds and possibly the material they are made from. Remember the colours will look different of an evening under artificial lights than they do during the day under natural light. We have uPVC white window frames with classic cream architraves. I recently purchased some block out roller blinds and spent hours agonising over whether to match the windows or the trim so I understand your dilemma. I ended up matching the white of the windows because we wanted the blinds to 'disappear' when they are opened. Have attached a pic to show the white windows with classic cream trim fyi....

A photo of your house might help Houzzers advise better! Feel free to share

Here are a couple of other angles that show the back of the house with the office - currently clad in weatherboards and duo tone with Dune and Ironstone but soon to be all Ironstone corrugated iron like the office - and the entry at the front of the house. Do I just keep the Dune, or go for a lighter white?

Hi guys, I'm just wanting a bit of advice regarding exterior paint colours. We're building a weatherboard house and wanting to go for a light colour scheme. I'm thinking surfmist for the roof and gutters and dover white for the garage door. I'm wanting white window trims and fascia with off white/warmer white weatherboards. Potentially something like Dulux snowy mountains or snowy mountains half for the weatherboards. With the white fascia and window trims would you suggest matching it to the garage door i.e. dover white? Or is there another white that might look better? Thanks 😊