I got really bored so I just did this.
I also added some shading to make the menu text at least bearable to read.

This is an add-on for Menu Backgrounds. Install the mod first before downloading this pack.
This menu background pack contains both still image and video versions.

PREVIEW:

Sources:

Element	Still	Video
blackmarket_all	Dolphenry (Pixiv)	N/A
blackmarket_armor	イコモチ (Pixiv)	N/A
blackmarket_crafting	jellen aura (Pixiv)	N/A
blackmarket_item	*zoff (Pixiv)	N/A
blackmarket_mask	Pleia90 (Pixiv)	N/A
blackmarket_weapon_color	おゆゆ (Pixiv)	N/A
blackscreen	Mazumaro (Pixiv)	Ninomae Ina'nis(?)
briefing	oksuri (Pixiv)	oriinte (Contractor Video - Twitter) / 海鼠 (Background Art - Pixiv)
character_customization	beescuit (Pixiv)	N/A
crew_management	2nii (Pixiv)	N/A
crime_spree_lobby	Klaius (Twitter)	Ninomae Ina'nis (Artist) / Shikabashi (Animator) (Twitter)
crimenet	advarcher (Pixiv)	N/A
endscreen	少女人 (Pixiv)	Ninomae Ina'nis (Artist) / Veranze (Animator) (Twitter)
infamy_preview	黒兎/Kurot (Pixiv)	eufrik (Twitter)
inventory	KUEN (Pixiv)	Kaynimatic (Twitter)
loading	梅まろ (Pixiv)	N/A
lobby	有本　亘 (Pixiv)	Ninomae Ina'nis (Artist) / Shikabashi (Animator) (Twitter)
loot	海鼠 (Pixiv)	Zania (Twitter)
movie_theater	Ninomae Ina'nis (Twitter)	LuLuLu (Twitter)
safe	2nii (Pixiv)	N/A
standard	Ninomae Ina'nis (Twitter)	Ninomae Ina'nis (Artist) / Veranze (Animator) (Youtube)

I do not own any of these works in any way.
If you're the artist of any of these works and do not want them included, please either write down a comment or private message me.