On the limited budget that you have I would keep things classic and simple. Since you don't intend to paint the siding (which would make a significant change to the look of your house) I suggest you paint the panels under the windows on the ground floor the same colour as the siding, paint the shutters and front door in black. Replace your address plate with large black numbers and place high black planters by the door. A walkway and landscaping will do wonders so that's where I spend the money.
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above kitchen window
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