Oldest Girl's blanket...

I've finally got myself motivated enough to a) pick a pattern and b) pick out colours for Oldest Girls blanket.
The pattern I'm going to use is the Mixed Stitch Stripey from Little Woollie. Oldest Girl loves blues, so I'm going to make a blanket in shades of blues, creams, greys, and maybe a random white (perhaps the bobbles?).
Basically, I'm going to make this

... look like this

(Photo courtesy of Little Woollie at http://littlewoollie.blogspot.com.au/ and tempyjo at http://gertieleigh.blogspot.co.uk/ )

Colours and designs...

So, I asked the other day for some colour inspirations...
This is Isabella's blanket with her quilt (doona/duvet) cover

And this is the blanket pattern I have 

Similar, yes?

So, the question is, what colours should I make the blanket in for Margaret? This is her quilt cover...

I was thinking red, pink, white, blue...

And then there's Katharine's quilt cover (which is still packed for now, but this is the matching pillow case)

I'm thinking light blue, royal blue, yellow and red... 

And that's where I'm at for now... 

Some input, please!

For those that don't know (and under which rock have you been living?), I crochet.
I recently bought Kim Werker's Crocheted Gifts since Isabella has a star blanket that was crocheted by a friend.
So, here's where you all come in... My design Pinterest board has colour swatches. Can you jump over there and please tell me which would be best for the princess (Margaret, age 5), which would be best for the Doctor Who obsessed child (Katharine, age 10), and which would be best for Ian and I (we have a green quilt cover and a blue and coffee quilt cover, so coordinating would be best).
Thanks, guys :)