Dear 

if i got u right , u wanna change the styling of the attachmennt links on smartforms.

and Yes i do beleive there is a way to change its styling , either on your custom theme (if you have one)

or use a javascript function inside literal data label to change the css of the attachment links .

btw , using javascript function will only affect this specific smartform , so its better to have a custom css theme .

and incase u dont have a custom theme , check the below link 

http://community.k2.com/t5/K2-blackpearl/K2-smartforms-Theme-Builder/ba-p/1095

after you have the custom theme , edit that file and inside it add a selector for the attachment links .

for example if u wanna change h1 elements color u go for something like

h1{

color:red;

}

Hope my thoughts help .

Regards.