I know I can use the package hyperref for urls, but I want is to create a definition that uses this and assigns a color, for example
\c{url}{Something}
would write Something in crimson color linked to the url (and assume default urls aren't in crimson)

\usepackage[colorlinks=true,urlcolor=magenta]{hyperref}and\href{http://www.myurl.com}{something}? – ebosi Apr 06 '16 at 07:47