Ok so here's how it works.
First, you will need winter board (which it seems like you have). In /private/var/stash/themes.xxx make a folder called "yourtheme.theme". Inside of that folder, make a folder called UIImages (caps matters).
Next, you will have to make or find the images you want, or borrow them from other themes. I see you want them all to match, so you may want to do it yourself, or see if someone could help you out.
The wifi images are named "ColorOnGrayShadow_X_WifiBars@2x.png" and "WhiteOnBlackEtch_X_WifiBars@2x.png" where X is the number 0-3. You will need 8 total (4 color-on-gray and 4 white-on-black-etch).
The cellular ones are easier. They are named "ColorOnGrayShadow_DataType4G@2x.png", "ColorOnShadow_DataTypeEDGE@2x.png" and "ColorOnGrayShadow_DataTypeLTE@2x.png". There is also a "WhiteOnBlackEtch" for each of these too.
The ones with color in the name should be darker, as they show on the lighter statusbar. The etched ones should be etched or light/white in color, as they are for the black bar.
Good luck!