Secret to cohesive color schemes: pick a bunch of colors you want to do (purple, blue, etc like you did here), then pick an overall color (let's say orange, for playfulness) that you want to tint everything towards... Overlay the "overall color" (or soft light, or whatever blending mode depending on if you want darker or lighter colors) and play with the opacity till you get something you can work with.
I did #FF9C00 set to Overlay and opacity set to 25% over your original choices to get this scheme.
In case you haven't noticed, there's now a video tutorial going a little bit more in-depth on this technique on Method & Craft! Check it out here.
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