Render 16x16 PNG In-World [1.19.2]

render.java

        Camera renderInfo = Minecraft.getInstance().gameRenderer.getMainCamera();
        stack.pushPose();

        Vec3 pos = Vec3.atCenterOf(new BlockPos(0, 140, 0)); // Replace with position to render at
        stack.translate(-renderInfo.getPosition().x + pos.x,
                -renderInfo.getPosition().y + pos.y,
                -renderInfo.getPosition().z + pos.z);
        stack.mulPose(Minecraft.getInstance().getEntityRenderDispatcher().cameraOrientation());
        stack.mulPose(Vector3f.YP.rotationDegrees(180));
        // Should be held in a field somewhere instead of creating every render
        // Replace with a path to whatever texture you want to render
        ResourceLocation speedLoc = new ResourceLocation("textures/mob_effect/speed.png"); 
        VertexConsumer vertexConsumer =
                Minecraft.getInstance().renderBuffers().bufferSource().getBuffer(RenderType.entityCutoutNoCull(speedLoc));
        PoseStack.Pose pose = stack.last();
        Matrix4f matrix4f = pose.pose();
        Matrix3f matrix3f = pose.normal();
        int maxLight = LightTexture.pack(15, 15);
        // DragonFireballRendererMixin should be a mixin that exposes the `vertex` method
        DragonFireballRendererMixin.vertex(vertexConsumer, matrix4f, matrix3f, maxLight, 0f, 0, 0, 1);
        DragonFireballRendererMixin.vertex(vertexConsumer, matrix4f, matrix3f, maxLight, 1f, 0, 1, 1);
        DragonFireballRendererMixin.vertex(vertexConsumer, matrix4f, matrix3f, maxLight, 1f, 1, 1, 0);
        DragonFireballRendererMixin.vertex(vertexConsumer, matrix4f, matrix3f, maxLight, 0f, 1, 0, 0);
        stack.popPose();

As one would imagine, this is heavily based on DragonFireballRenderer