Hey there (:
Blue mascara is hott right now!
If you want to save then try out Hard Candy's Lash call- Lengthening Mascara in Peacock.
The colori s very vibrant and noticable.
Retails for about $6 at Walmart. (Hard Candy is only sold at Walmart)
If you want Splurge, then I suggest Diorshow Mascara in Azure Blue which retails for $25.
I'd choose Hard Candy Mascara over Dior anyday since I found Dior to be very clumpy and always fell off within in an hour (FYI: I always wear eyelash primer) But then again everyone is different.