Untitled modular fold by Tomoko Fuse

Made with six squares. From Tomoko Fuse's Three-Dimensional Kaleidoscope (volume 4 of her New World Origami series).

This Week's Folds (24 Mar 2020–30 Mar 2020)

Dollar bill squirrel by John Montroll

From John Montroll's Dollar Bill Origami

Ladybug by Robin Moseley

From The Newsletter for the Friends of the Origami Center of America, #25 (Spring 1987).

Bookcase by Mark Bolitho

From Mark Bolitho's The Origami Home.

Cat by Kunihiko Kasahara

From Kunihiko Kasahara's Extreme Origami

Wizard by Bob Neale

From Jay Ansill's Mythical Beings.

Centipede by Mark Bolitho

Made from eight squares. From British Origami #121 (December 1986).

Cardinal by Michael G. LaFosse

The instructions called for "duo paper" colored red on one side, black on the other. I just used a red and a black sheet back to back and folded them as if they were a single sheet.
From Michael G. LaFosse's Advanced Origami.

This Week's Folds (17 Mar 2020–23 Mar 2020)

Easy two-piece tree by Toshikazu Kawasaki

Made from a preliminary base and a bird base (trunk is 3/4 the size of the leafy part). From Toshikazu Kawasaki's Origami Dream World.

Rooster and brooding hen by Florence Temko

From Florence Temko's Paper Pandas and Jumping Frogs.

"Ca$h Flow" (sailboat) by Steve Vinik

From The Newsletter for the Friends of the Origami Center of America #22 (May 27, 1986)

Rowboat by David Shall

From The Friends of the Origami Center of America's Origami Convention '81.

Cow by Yehuda Peled

I couldn't quite figure out how to make the ears, and the body looks too long. Not sure if it's the fault of the diagrams or me.

From British Origami #307 (December 2017). This was a free issue on the B.O.S. website; I don't own a hard copy of it.

Crane envelope by Minako Ishibashi

From British Origami #120 (October 1986)

Koala by Akira Yoshizawa

Another tough Yoshizawa fold. Instructions were incomplete (e.g., no info on how to make the ears).
From British Origami #119 (August 1986).

This Week's Folds (10 Mar 2020–16 Mar 2020)

Settee by Kosho Uchiyama

Instructions call for a 3x4 sheet; I just folded one edge down a fourth of the way.
From Kosho Uchiyama's Origami.

Chair by Kosho Uchiyama

Instructions call for a 2x1 sheet; I just used a square folded in half. From Kosho Uchiyama's Origami.
(I missed a day, so I'll probably post another fold later today.)

Spherical wrapping by Jun Mitani

Made from an octagonal sheet of card stock. Not really what I'd call "origami." More like "paper engineering." From Jun Mitani's Three-Dimensional Origami with Beautiful Curves.

Rabbit by Robert Lang

From Robert Lang's The Complete Book of Origami.

Monkey by Isao Honda

Made with two squares (and a bunch of tape to hold it together). From Isao Honda's The World of Origami.

Buddhist monk by Kyo Araki

Made with two squares. From Kyo Araki's Kyo-Origami: Kyoto City in Origami Art

Crow by Toyoaki Kawai

I have only a very bad photocopy of this book and cannot find any information about it. To the best of my (er, Google Translate's) ability to translate, this is Toyoaki Kawai's Origami II: Fairy Tale Theme (thematically arranged around children's stories). The particular story here seems to be "The Crow and the Pitcher" (crow drops pebbles in pitcher to raise the water level so he can drink).

This Week's Folds (3 Mar 2020–9 Mar 2020)

Purple people eater by Isamu Asahi

From Isamu Asahi's Origami Monsters

Frog by Kunihiko Kasahara

From Kunihiko Kasahara's Super Esoteric Works for the Enthusiast (also translated as Highly Challenging Origami Models for Maniacs). I have not been able to find any information about this book; it appears to have a 1976 copyright date. I do not own this book, just a poor photocopy of it.