These are the easiest borders to do. Bust not everyone knows how to do em, so here they are:
1) Open up your base.
2) Grab your select tool and select the entire icon
3) Hit Print Screen on your keyboard. (this takes a screenshot of your desktop)
4) Paste the screenshot into the base. You'll see the corner of the Adobe Program. Don't worrk about it. Grab the
Move tool and
drag the top layer towards the corner of the screen (the same corner that appears in the screenshot)
The icon with the select border will appear when the two corners are close. It sounds a little confusing, sorry T_T
5) When the icon is aligned how you want it, flatten your layers down.