Start by 1st creating a new layer. Click on the adjustment layer button ( looks like this) and select Hue/Saturation. Adjust the Saturation to +25 or +30 and the lightness to +10 or +15 (depending on how light the original image is).
Next create another adjustment layer using the Color Fill option. Select a pale yellow, set to Multiply at 80% Opacity and 80% Fill (adjust opacity and fill to your liking).
Create one more Color Fill layer. Select a light blue, set to Color Dodge at 50% Opacity and 50% Fill (adjust opacity and fill to your liking).
Create a Gradient adjustment layer. Set the gradient from transparent to white, adjust the angle to your liking. Set to Soft Light at 80% Opacity.
Save and Enjoy. Remember that these are just guidelines, every image will be a little different. Don't be afraid to tweak, adjust or omit some of the steps as you see fit.
(Tutorial Source: The Design Nocture)