Dark theme (twilight) for sublime text folder sidebar. Click Browse Packages and add file named "Default.sublime-theme" to Packages/User

Default.sublime-theme

[
{
"class": "sidebar_container",
// right border
"layer0.tint": [84,84,84],
"layer0.opacity": 1.0,
"layer0.draw_center": false,
"layer0.inner_margin": [0, 0, 1, 0],
"content_margin": [0, 0, 1, 0]
},
{
"class": "sidebar_tree",
"row_padding": [8, 3],
"indent": 12,
"indent_offset": 17,
"indent_top_level": false,
// background
"layer0.tint": [20,20,20],
"layer0.opacity": 1.0,
"dark_content": false
},
{
"class": "sidebar_heading",
// heading 
"color": [219,230,230],
"font.bold": true,
"shadow_color": [0,0,0],
"shadow_offset": [0, 1]
},
{
"class": "sidebar_heading",
"parents":
[
{ "class": "tree_row", "attributes": ["selected"] }
],
"shadow_color": [0, 0, 0]
},
{
"class": "sidebar_label",
// folder/file labels
"color": [134,134,134],
"font.bold": false
, "shadow_color": [0, 0, 0], "shadow_offset": [0, 1]
},
{
"class": "sidebar_label",
"parents": [{"class": "tree_row", "attributes": ["selected"]}],
// selected file
"color": [255,255,255]
, "shadow_color": [26, 26, 26], "shadow_offset": [0, 1]
},
{
"class": "sidebar_label",
"parents": [{"class": "tree_row", "attributes": ["expandable"]}],
"settings": ["bold_folder_labels"],
"font.bold": true
}
]

So much better! Thanks @jonathanhculver

Glad you found it useful @bendilley!