Pictures would help...are you planning on getting a new roof or is it staying? If it's staying, is it tile, shingle, metal? And what region is it located?

Do you have a photo of the front of your home? That usually helps when it comes to colour scheme questions.

Without knowing any more info , I'd say its near impossible for anyone but you to know what colour/s to choose -- do you want the house to blend in but have its own style , or do you want it to stand out ? What colours are your main furniture items and even kitchen etc ? For xxample , if keeping the beige walls , how about doing the eves and gutters and garage door in a tangy ( bright , but not glaring ) orange -- this would work with the existing colours and not require a complete repaint . BUT if your kitchen was mainly various shades of , say , green and teal , and your lounge suite and duvet covers were mainly blue hues , that may 'feel' funny , clashing with the exterior ? Of course , blue and beige exterior may not work with the brown aluminium , as youve recognised . Another option ( a bit hard to tell from the pictures ) is that a light grey ( repaint the beige ) with mid-charcoal base boards may work with the brown aluminium , then a bright colour on the gutters and front and rear doors to suit -- anything from sea blue to bright yellow , orange , red , even white or off-white would probably work .

Personally , I think that to give advice , you'd need to supply more information -- what the neighbourhood is like , your favourite colours , the plants in your garden , and the likes . I quite like the colours there , but I'd do the front door , the gutters , the window sills and those cap pieces up the pillar supports in an orange or teal or red or similar to add some Wow and excitement , but thats just me .